News has leaked that Microsoft has enabled support for OpenGL to work with the Vista compositing desktop, as of the most recent preview build. Previously Microsoft's plan had been to force OpenGL to be translated to Direct3D, reducing performance by 50% and locking the OpenGL version to 1.4 only.

If Microsoft dropped support for OpenGL, wouldn't that benefit Apple, esp. now that it's on Intel? I wonder just how happy Dell would be?

That makes no sense at all. DX only runs in windows, Apple uses OpenGL. How does MacOS running on intel come into factor what API devs choose to program with? Where does Dell fit into all this, they just make hardware for a lords and masters in redmond.